Measurements of Higgs boson production via gluon-gluon fusion and vector-boson fusion using $H\to W{W}^{\ast }\to \ell \nu \ell \nu$ decays in $pp$ collisions with the ATLAS detector and their effective field theory interpretations

Abstract

Higgs boson production cross-sections via gluon-gluon fusion and vector-boson fusion in proton-proton collisions are measured in the $H\to W{W}^{\ast }\to \ell \nu \ell \nu$ decay channel. The Large Hadron Collider delivered proton-proton collisions at a centre-of-mass energy of $13\text{TeV}$ between 2015 and 2018, which were recorded by the ATLAS detector, corresponding to an integrated luminosity of $140{\text{fb}}^{-1}$. The total cross-sections for Higgs boson production by gluon-gluon fusion and vector-boson fusion times the $H\to W{W}^{\ast }$ branching ratio are measured to be $12.4_{-1.2}^{+1.3}\text{pb}$ and $0.79_{-0.16}^{+0.18}\text{pb}$, respectively, in agreement with the Standard Model predictions. Higgs boson production is further characterised through measurements of Simplified Template Cross-Sections in a total of fifteen kinematic fiducial regions. A new scheme of kinematic fiducial regions has been introduced to enhance the sensitivity to CP-violating effects in Higgs boson interactions. Both schemes are used to constrain CP-even and CP-odd dimension-six operators in the Standard Model effective field theory.

90 pages in total, author list starting page 72, 25 figures, 7 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGP-2024-07

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